Answer:
B. 16 hrs
Step-by-step explanation:
Distance = rate × time
The best way to do this is to make a table with the info. We are concerned with the trip There and the Return trip. Set it up accordingly:
d = r × t
There
Return
The train made a trip from A to B and then back to A again, so the distances are both the same. We don't know what the distance is, but it doesn't matter. Just go with it for now. It'll be important later.
d = r × t
There d
Return d
We are also told the rates. There is 70 km/hr and return is 80 km/hr
d = r × t
There d = 70
Return d = 80
All that's left is the time column now. We don't know how long it took to get there or back, but if it took 2 hours longer to get There than on the Return, the Return trip took t and the There trip took t + 2:
d = r × t
There d = 70 × t+2
Return d = 80 × t
The distances, remember, are the same for both trips, so that means that by the transitive property of equality, their equations can be set equal to each other:
70(t + 2) = 80t
70t + 140 = 80t
140 = 10t
14 = t
That t represents the Return trip's time. Add 2 hours to it since the There trip's time is t+2. So 14 + 2 = 16.
B. 16 hours
The leading term is the term with the highest degree (highest exponent number). Here, the leading term is =》B) - 5x²y³
³ is the highest degree in the given expression.
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Hope it helps ⚜
Anyone help with my geometry quiz please
Answer: 2 x 
Explanation: To write 20,000 in scientific notation, first write a decimal point in the number so that there is only 1 digit to the left of the decimal point.
So here we have 2.0000 and notice that there is 1 digit to the left of the decimal point. Next, count the number of places that we would need to move the decimal point in 2.0000 to get back to the original number.
Since we would need to move the decimal point 4 places to the right to get back to the original number, we would need to multiply 2.0000 by power.
Notice that our exponent is positive because we would need to move the decimal point to the right and since 2.0000 is equal to 2, our final answer
is 2 x .
It's important to understand that we will always have a power of 10 when writing in scientific notation. The exponent can change depending on how many digits you have, but you will always have 10 to some power.
